VLA observations of the 9/sub 2/--10/sub 1/ A/sup +/ methanol masers toward W3(OH)

Journal Article · Sat Jun 15 04:00:00 EDT 1985 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/184496· OSTI ID:5640467

Menten, K M; Johnston, K J; Wilson, T L; Walmsley, C M; Mauersberger, R; Henkel, C

Measurements at 2'' resolution of the 9/sub 2/--10/sub 1/ A/sup +/ emission line of methanol toward W3(OH) are presented. The frequency resolution was 12.2 kHz, or 0.16 km s/sup -1/ at the line rest frequency 23121.01 MHz. The two velocity components seen in single-dish spectra are separated by approx.1'', but each is unresolved. This implies intrinsic source sizes of < or =1''. For the masing spike feature at -43.3 km s/sup -1/, the line brightness temperature is > or =2 x 10/sup 4/ K. For the broader emission at -43.9 km s/sup -1/, it is > or =5000 K, showing that this emission is also caused by masing. The spike is 0''.5 southwest and the broader feature is 1''.5 northwest of the continuum peak. An absorption-line spectrum of the 10/sub 1/--9/sub 2/ A/sup -/ line taken with the 100 m telescope is also presented, and it is concluded that this absorption and the 9/sub 2/--10/sub 1/ A/sup +/ maser emission are both formed in the same cloud where OH masers and ammonia absorption are present.

• Research Organization: Max-Planck-Institut fuer Radioastronomie
• OSTI ID: 5640467
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 293:2; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics &amp; Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
ALCOHOLS
AMMONIA
AMPLIFIERS
CHEMISTRY
COSMIC RADIO SOURCES
COSMOCHEMISTRY
DISTRIBUTION
ELECTRONIC EQUIPMENT
EMISSION SPECTRA
ENERGY LEVELS
EQUIPMENT
H2 REGIONS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MASERS
METHANOL
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
SPATIAL DISTRIBUTION
SPECTRA